Vacuum cleaner



FIG. 1 is a top plan view of the vacuum cleaner showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view being identical;

FIG. 4 is a left side elevational view thereof; and

FIG. 5 is a right side elevational view thereof. 

The ornamental design for a vacuum cleaner, as shown and described. 